Well it may be beyond you but in the real world where you have multiple high end engine builders doing engines of significant power and have had issues with the Cometics and so they all now copper coat and no more issues.....take it however you want.
Real world? A real would you don't live in because your not one of these "high end builders' you mention.. Gimme a break :rolleyes:
Have you ever had to coat them? Do you think spraying copper paint on a rubber surface is a game changer?
If you're a "high end" builder you are most likely to use an upgraded gasket instead of trying to spray seal one that's not up to the job.